Afaik: One way to tell whether you have the combox or MULF if you can't visually see it is to see whether a regular iPod cable (not the bmw dongle) and an iPod with mp3s will play over the stereo. If so, it's the combox. If not, it's the MULF.
Euro spec wide angle mirrors; Dinan front sway bar; sport wheel + flappy paddles; staggered sport rims with Conti ExtremeContact DW. JL Audio 600/6 + technic harness; Gladen Audio 8" Woofers + musicarnw adapters; Morel Hybrid Ovations. Project pile: 2 sets of rims, more staggered and less; M3 flappy paddles; Msport factory suspension: front & rear sways, springs, & struts.